about trailer wiring or electrical issues, contact the curt Tech Support team toll-free at 800.798.0813. Answered in this chapter: What type of wiring system does my vehicle have? It installs in the harness just before the trailer connector. Step 6: Install the taillights. Hooking Up Your Trailer. Use a circuit tester to check that the correct wires are tapped into, the wiring harness connectors are plugged into the correct vehicle connectors, and check that connectors are plugged in all the way. It sends the stop, tail and turn signals along three separate wires. For most vehicles we offer a plug-and-play T-shaped harness (so called because it connects to both of your tail lights) that connects your vehicle lights to the trailer lights. A few vehicles use separate lamps for the brake and the turn-signal functions of the rear lights.
There are four possibilities: There is no signal going into the box, meaning something is incorrect on the vehicle. Too much paint, dirt, or rust can cause bad grounds, so make sure the ground is secured to the bare metal frame. How do I connect two different connector types? Back to the top, how to Wire Your Vehicle for Towing. Note: If you purchased your wiring harness from m and none of these fix your problem please feel free to contact us so our product experts, and installers can determine possible remedies or warranty coverage. The other has round pins. That's fine-until you realize the trailer uses a single 2-filament bulb for all three functions. Because wire colors can vary, they are not as reliable for determining functions. The coating on trailer wires can wear thin, often at the connection to the trailer's taillight or where the wires pass over the trailer suspension. The connector should come with a list specifying which pin handles which circuit. Weak Ground Video showing how to wire the ground If you find some, but not all, lighting functions work properly you may have a ground problem.